I picked up an Richard Mahrholdt Mauser made in Innsbruck. From what I can tell, the rifle was likely made in the 50's. Caliber is 270 Win. Stock is a hog-back style with double flutes. Barrel is half octagon half round with an integral rib. The rifle has a Nickel Supra B 4-10 power scope that is mounted in a scope mount I can't identify. It looks like a modern Leupold/Redfield style 1 piece base. But a twist of the rear lever releases the rear mount, allowing the scope and rings to twist on the front dovetail and be removed. Anyone have any information on this old mount?